RIGOL DG4000 Series - Manual (Page 116)

RIGOL Chapter 5 Modulated Waveform Output
DG4000 Series User’s Guide 5-16
To Set FSK Rate
When internal source is selected, press FSK Rate to set the frequency at which
the output frequency shifts between “carrier frequency” and “hop frequency”.
 Use the numeric keyboard or direction keys and knob to input the desired
frequency value.
 The frequency range is from 2mHz to 1MHz and the default is 100Hz.
Note: when “Ext” modulation source is selected, this menu is grayed out and
disabled.
To Set Hop Frequency
Alternating frequency (“hop” frequency) is the modulating frequency. The range of
hop frequency depends on the carrier waveform currently selected. Press
HopFreq to highlight it and input the desired frequency value using the numeric
keyboard or direction keys and knob.
 Sine: 1μHz to 160MHz
 Square: 1μHz to 50MHz
 Ramp: 1μHz to 4MHz
 Arb: 1μHz to 40MHz
To Set Modulating Polarity
Press Polarity to select the “Pos” or “Neg” polarity of the modulating waveform to
control the output frequency.
In internal modulation, set the polarity to “Pos” and the generator would output
the carrier frequency when the modulating waveform is logic low and output the
hop frequency when the modulating waveform is logic high. The situation is the
opposite when the polarity is set to “Neg”.
In external modulation, set the polarity to “Pos” and the generator would output
the carrier frequency when logic low level is input and output the modulating
frequency when logic high level is input. The situation is the opposite when the
polarity is set to “Neg”.